SCHEDULE 14A INFORMATION

PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE

SECURITIES EXCHANGE ACT OF 1934

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☐  Preliminary Proxy Statement

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☐  Definitive Proxy Statement

☒  Definitive Additional Materials

☐  Soliciting Material Pursuant to Section 240.14a-12

Schnitzer Steel Industries, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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*** Exercise Your Right to Vote *** Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to Be Held on January 26, 2021. SCHNITZER STEEL INDUSTRIES, INC. SCHNITZER STEEL INDUSTRIES, INC. 299 SW CLAY ST. PORTLAND, OREGON 97201 D28083-P46789 Meeting Information Meeting Type: Annual Meeting For holders as of: November 30, 2020 Date:January 26, 2021Time:8:00 a.m. Pacific Time Location: Meeting live via the Internet-please visit www.virtualshareholdermeeting.com/SCHN2021. The company will be hosting the meeting live via the Internet this year as authorized by the Board. To attend the meeting via the Internet please visit www.virtualshareholdermeeting.com/SCHN2021 and be sure to have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page). You are receiving this communication because you hold shares in the company named above. This is not a ballot. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. See proxy the materials reverse and side voting of this instructions notice to obtain .

Before You Vote How to Access the Proxy Materials Proxy Materials Available to VIEW or RECEIVE: NOTICE How to View AND Online: PROXY STATEMENT FORM 10-K Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) and visit: www.proxyvote.com. How to Request and Receive a PAPER or E-MAIL Copy: If you want to receive a paper or e-mail copy of these documents, or proxy materials for future shareholder meetings, you must request one. There is NO charge for requesting a copy. Please choose one of the following methods to make your request:1) BY INTERNET: www.proxyvote.com2) BY TELEPHONE: 1-800-579-16393) BY E-MAIL*: sendmaterial@proxyvote.com * If requesting materials by e-mail, please send a blank e-mail with the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) in the subject line. Requests, instructions and other inquiries sent to this e-mail address will NOT be forwarded to your investment advisor. Please make the request as instructed above on or before January 12, 2021 to facilitate timely delivery. How To Vote Please Choose One of the Following Voting Methods Vote By Internet: Before The Meeting: Go to www.proxyvote.com. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. During The Meeting: Go to www.virtualshareholdermeeting.com/SCHN2021. Have the information that is printed in the box marked by the arrow XXXX XXXX XXXX XXXX (located on the following page) available and follow the instructions. Vote By Mail: You can vote by mail by requesting a paper copy of the materials, which will include a proxy card. D28084-P46789

Voting Items The Board of Directors Recommends a Vote FOR all nominees in Proposal 1 and FOR Proposals 2 and 3. 1. Election of directors Nominees: 01) Glenda J. Minor 02) Michael W. Sutherlin 2. To vote on an advisory resolution on executive compensation. 3. To ratify the selection of independent registered public accounting firm. The proxies may vote in their discretion as to other matters which may come before the meeting. - P46789 D28085

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